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a in (-oo:+oo)
a/2+2/5 = 2*a+4/5 // - 2*a+4/5
a/2-(2*a)+2/5-(4/5) = 0
a/2-2*a+2/5-4/5 = 0
-3/2*a-2/5 = 0 // + 2/5
-3/2*a = 2/5 // : -3/2
a = 2/5/(-3/2)
a = -4/15
a = -4/15
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